(E)-6-[3-[[2-(tert-butylamino)-3,4-dioxo-1-cyclobutenyl]amino]phenyl]-6-pyridin-3-ylhex-5-enoic acid
(E)-6-[3-[[2-(tert-butylamino)-3,4-dioxo-1-cyclobutenyl]amino]phenyl]-6-(3-pyridyl)hex-5-enoic acid
(E)-6-[3-[[2-(tert-butylamino)-3,4-diketo-1-cyclobutenyl]amino]phenyl]-6-(3-pyridyl)hex-5-enoic acid
(E)-6-[3-[[2-(tert-butylamino)-3,4-dioxo-1-cyclobutenyl]amino]phenyl]-6-pyridin-3-yl-hex-5-enoic acid